Multilayer ceramic capacitor

Abstract

A multilayer ceramic capacitor includes: a ceramic body including a dielectric layer, a first internal electrode and a second internal electrode arranged to face each other with the dielectric layer interposed therebetween; and a first external electrode disposed on an exterior surface of the ceramic body and a second external electrode disposed on the exterior surface of the ceramic body, wherein the ceramic body includes an active portion, forming capacity, cover portions disposed on upper and lower portions of the active portion, and margin portions disposed on a side surface of the active portion, and wherein the dielectric layer, the cover portions, and the margin portions of the active portion include magnesium (Mg) having content of more than 0 mole, and less than or equal to 1.0 mole, relative to titanium (Ti) included in the dielectric layer, the cover portions and the margin portions of the active portion.

What is claimed is: 
     
       1. A multilayer ceramic capacitor comprising:
 a ceramic body including an active portion and margin portions disposed on side surfaces of the active portion, the active portion including a dielectric layer, a first internal electrode and a second internal electrode arranged to face each other with the dielectric layer interposed therebetween in a stacking direction; and 
 a first external electrode disposed on an exterior surface of the ceramic body and electrically connected to the first internal electrode and a second external electrode disposed on the exterior surface of the ceramic body and electrically connected to the second internal electrode, 
 wherein a thickness of the dielectric layer is 0.4 μm or less, 
 wherein the margin portions include magnesium (Mg) having a content of more than 0 mole and less than or equal to 1.0 mole, relative to 100 moles of titanium (Ti) included in the margin portions, 
 wherein each of the margin portions includes a first region adjacent to an outer surface of the ceramic body and a second region adjacent to the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the margin portions is greater than a content of magnesium (Mg) included in the second region, 
 the ceramic body further includes cover portions disposed on upper and lower surfaces of the active portion in the stacking direction, and 
 compositions of the cover portions and the dielectric layer are substantially the same. 
 
     
     
       2. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in the active portion and the margin portions includes a main component including Ba and Ti. 
     
     
       3. The multilayer ceramic capacitor of  claim 2 , wherein the dielectric layer in the active portion and the margin portions includes a third subcomponent including Si. 
     
     
       4. The multilayer ceramic capacitor of  claim 3 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       5. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in the active portion and the margin portions include a first subcomponent including at least one of Mn, V, Cr, Fe, Ni, Co, Cu, or Zn. 
     
     
       6. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in the active portion and the margin portions include a second subcomponent including at least one of Ba or Ca. 
     
     
       7. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in the active portion and the margin portions includes a third subcomponent including Si. 
     
     
       8. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in the active portion and the margin portions includes a fourth subcomponent including at least one of Y, Dy, Ho, Er, Gd, Ce, Nd, Sm, La, Tb, Yb or Pr. 
     
     
       9. The multilayer ceramic capacitor of  claim 1 , wherein the dielectric layer in dielectric layer in the active portion and the margin portions includes a fifth subcomponent including Mg or Al. 
     
     
       10. The multilayer ceramic capacitor of  claim 9 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       11. The multilayer ceramic capacitor of  claim 1 , wherein the content of magnesium (Mg) in the dielectric layer of the active portion and the cover portions is same. 
     
     
       12. The multilayer ceramic capacitor of  claim 1 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       13. The multilayer ceramic capacitor of  claim 1 ,
 wherein in a direction in which the first region and the second region of the margin portions are separated from each other, a width of the first region is greater than a width of the second region. 
 
     
     
       14. The multilayer ceramic capacitor of  claim 1 ,
 wherein a degree of densification of the first region of the margin portions is larger than a degree of densification of the second region of the margin portions. 
 
     
     
       15. The multilayer ceramic capacitor of  claim 1 ,
 wherein the cover portions extend over an entire width of the body, and 
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is different from a content of magnesium (Mg) included in the second region of the cover portions. 
 
     
     
       16. The multilayer ceramic capacitor of  claim 1 ,
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is different from a content of magnesium (Mg) included in the second region of the cover portions. 
 
     
     
       17. The multilayer ceramic capacitor of  claim 16 ,
 wherein a content of magnesium (Mg) included in the first region of the cover portions is greater than a content of magnesium (Mg) included in the second region of the cover portions. 
 
     
     
       18. The multilayer ceramic capacitor of  claim 16 ,
 wherein a content of magnesium (Mg) included in the first region of the cover portions is smaller than a content of magnesium (Mg) included in the second region of the cover portions. 
 
     
     
       19. A multilayer ceramic capacitor comprising:
 a ceramic body including an active portion and margin portions disposed on side surfaces of the active portion, the active portion including a dielectric layer, a first internal electrode and a second internal electrode arranged to face each other with the dielectric layer interposed therebetween in a stacking direction; and 
 a first external electrode disposed on an exterior surface of the ceramic body and electrically connected to the first internal electrode and a second external electrode disposed on the exterior surface of the ceramic body and electrically connected to the second internal electrode, 
 wherein the ceramic body further includes cover portions disposed on upper and lower surfaces of the active portion in the stacking direction, 
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is greater than a content of magnesium (Mg) included in the second region, and 
 wherein the margin portions include magnesium (Mg) having a content of more than 0 mole and less than or equal to 1.0 mole, relative to 100 moles of titanium (Ti) included in the margin portions, 
 compositions of the cover portions and the dielectric layer are substantially the same and 
 a content of magnesium (Mg) included in a first region of the margin portions is greater than a content of magnesium (Mg) included in a second region of the margin portions. 
 
     
     
       20. The multilayer ceramic capacitor of  claim 19 , wherein
 the dielectric layer in the active portion and the margin portions includes a main component including Ba and Ti. 
 
     
     
       21. The multilayer ceramic capacitor of  claim 19 , wherein the dielectric layer in the active portion and the margin portions includes a third subcomponent including Si. 
     
     
       22. The multilayer ceramic capacitor of  claim 21 , wherein a thickness of the dielectric layer is 0.4 μm or less. 
     
     
       23. The multilayer ceramic capacitor of  claim 22 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       24. The multilayer ceramic capacitor of  claim 19 , wherein a thickness of the dielectric layer is 0.4 μm or less. 
     
     
       25. The multilayer ceramic capacitor of  claim 19 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       26. A multilayer ceramic capacitor comprising:
 a ceramic body including an active portion and margin portions disposed on side surfaces of the active portion, the active portion including a dielectric layer, a first internal electrode and a second internal electrode arranged to face each other with the dielectric layer interposed therebetween in a stacking direction; and 
 a first external electrode disposed on an exterior surface of the ceramic body and electrically connected to the first internal electrode and a second external electrode disposed on the exterior surface of the ceramic body and electrically connected to the second internal electrode, 
 wherein a thickness of the dielectric layer is 0.4 μm or less, 
 wherein the margin portions include magnesium (Mg) having a content of more than 0 mole and less than or equal to 1.0 mole, relative to 100 moles of titanium (Ti) included in the margin portions, 
 wherein the ceramic body further includes cover portions disposed on upper and lower surfaces of the active portion in the stacking direction 
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is different from a content of magnesium (Mg) included in the second region of the cover portions, 
 compositions of the cover portions and the dielectric layer are substantially the same and 
 a content of magnesium (Mg) included in a first region of the margin portions is greater than a content of magnesium (Mg) included in a second region of the margin portions. 
 
     
     
       27. The multilayer ceramic capacitor of  claim 26 ,
 the first region is adjacent to an outer surface of the ceramic body and the second region is adjacent to the first and second internal electrodes, and the content of magnesium (Mg) included in the first region of the margin portions is different from the content of magnesium (Mg) included in the second region of the margin portions. 
 
     
     
       28. The multilayer ceramic capacitor of  claim 27 , wherein the content of magnesium (Mg) included in the second region of the cover portions is greater than the content of magnesium (Mg) included in the first region of the cover portions. 
     
     
       29. The multilayer ceramic capacitor of  claim 26 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       30. The multilayer ceramic capacitor of  claim 26 , wherein the content of magnesium (Mg) included in the second region of the cover portions is greater than the content of magnesium (Mg) included in the first region of the cover portions. 
     
     
       31. The multilayer ceramic capacitor of  claim 26 ,
 wherein the ceramic body further includes cover portions disposed on upper and lower surfaces of the active portion in the stacking direction and extending to cover an entire width of the body. 
 
     
     
       32. A multilayer ceramic capacitor comprising:
 a ceramic body including an active portion and margin portions disposed on side surfaces of the active portion, the active portion including a dielectric layer, a first internal electrode and a second internal electrode arranged to face each other with the dielectric layer interposed therebetween in a stacking direction; and 
 a first external electrode disposed on an exterior surface of the ceramic body and electrically connected to the first internal electrode and a second external electrode disposed on the exterior surface of the ceramic body and electrically connected to the second internal electrode, 
 wherein a thickness of the dielectric layer is 0.4 μm or less, 
 wherein the dielectric layer includes a main component including Ba and Ti, 
 wherein the dielectric layer includes a third subcomponent including Si, and 
 wherein the margin portions include magnesium (Mg), each of the margin portions includes a first region adjacent to an outer surface of the ceramic body and a second region adjacent to the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the margin portions is different from a content of magnesium (Mg) included in the second region of the margin portions, 
 the ceramic body further includes cover portions disposed on upper and lower surfaces of the active portion in the stacking direction, 
 compositions of the cover portions and the dielectric layer are substantially the same and 
 the content of magnesium (Mg) included in the first region of the margin portions is greater than the content of magnesium (Mg) included in the second region of the margin portions. 
 
     
     
       33. The multilayer ceramic capacitor of  claim 32 , wherein a thickness of each of the first internal electrode and the second internal electrode is 0.4 μm or less. 
     
     
       34. The multilayer ceramic capacitor of  claim 32 ,
 wherein the content of magnesium (Mg) in the dielectric layer of the active portion and the cover portions is same. 
 
     
     
       35. The multilayer ceramic capacitor of  claim 32 ,
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is different from a content of magnesium (Mg) included in the second region of the cover portions. 
 
     
     
       36. The multilayer ceramic capacitor of  claim 32 ,
 wherein each of the cover portions is divided into a first region adjacent to an outer surface of the ceramic body and a second region adjacent to an outermost one of the first and second internal electrodes, and a content of magnesium (Mg) included in the first region of the cover portions is greater than a content of magnesium (Mg) included in the second region of the cover portions.